How to obtain the exact onset of a sound?

Hello!

I am presenting a sound using the function 'soundsc'. I want to send a marker exactly when the sound starts. I was using 'GetSecs' just after the 'soundsc' function to get the onset of the stimuli. Would that be accurate enough? If not, how could I now the exact onset of my sound?

Thank you in advance!

Answer 1

[Image Analyst]

Why can't you just read the sound and find when the magnitude exceeds a threshold that you think is required for it to be audible. Like if your sound amplitude ranges from -1 to 1, and you think the value needs to be more than 0.05 to be audible, just do

[y, fs] = audioread(filename);
startingIndex = find(abs(y) > 0.05, 1, 'first');